A majority of you may not keep up with Tumblr, but there is a big community of Rise of the Guardians fans on there. There is a blog called GuardiansoftheGuardians, and they are gathering all ROTG fans into helping create a book. It's called the 'Book of Belief'. They have even contacted William Joyce himself on this matter, and he's in full support of it.
Basically, they are rounding up fans, and they can submit fan letters and fan art in contribution to this book. The contribution deadline is October 1st, so there is plenty of time, but they still want to get the word out to people.
They will pick out a ton of submissions and put them all in a book. They are planning to send it to the two directors of Rise of the Guardians at the Dreamworks studio (since its all up to them if they want to make another movie) and they want to send a copy to William Joyce (the creator of The Guardians) as well. If the quality of the book is good, they might make it open to the public to sell the books online so everyone can buy them, and a portion of the money could possibly be sent to the Dreamwork's budget if they were to make another movie.
If you wish to read this project in further detail, please go here: guardiansoftheguardians.tumblr…
The rules for the submissions are here: guardiansoftheguardians.tumblr…
And people don't even have to give their full information. They can use an internet name if they wish to have that anonymity.
Please consider looking into this!